def update_tree(self, cur_to_split: List[Node], split_info: List[SplitInfo]):
"""
update current tree structure
----------
split_info
"""
LOGGER.debug('updating tree_node, cur layer has {} node'.format(len(cur_to_split)))
next_layer_node = []
assert len(cur_to_split) == len(split_info)
for idx in range(len(cur_to_split)):
sum_grad = cur_to_split[idx].sum_grad
sum_hess = cur_to_split[idx].sum_hess
if split_info[idx].best_fid is None or split_info[idx].gain <= self.min_impurity_split + consts.FLOAT_ZERO:
cur_to_split[idx].is_leaf = True
self.tree_node.append(cur_to_split[idx])
continue
cur_to_split[idx].fid = split_info[idx].best_fid
cur_to_split[idx].bid = split_info[idx].best_bid
cur_to_split[idx].missing_dir = split_info[idx].missing_dir
p_id = cur_to_split[idx].id
l_id, r_id = self.tree_node_num + 1, self.tree_node_num + 2
cur_to_split[idx].left_nodeid, cur_to_split[idx].right_nodeid = l_id, r_id
self.tree_node_num += 2
l_g, l_h = split_info[idx].sum_grad, split_info[idx].sum_hess
# create new left node and new right node
left_node = Node(id=l_id,
sitename=self.sitename,
sum_grad=l_g,
sum_hess=l_h,
weight=self.splitter.node_weight(l_g, l_h),
parent_nodeid=p_id,
sibling_nodeid=r_id,
is_left_node=True)
right_node = Node(id=r_id,
sitename=self.sitename,
sum_grad=sum_grad - l_g,
sum_hess=sum_hess - l_h,
weight=self.splitter.node_weight(sum_grad - l_g, sum_hess - l_h),
parent_nodeid=p_id,
sibling_nodeid=l_id,
is_left_node=False)
next_layer_node.append(left_node)
print('append left,cur tree has {} node'.format(len(self.tree_node)))
next_layer_node.append(right_node)
print('append right,cur tree has {} node'.format(len(self.tree_node)))
self.tree_node.append(cur_to_split[idx])
return next_layer_node
def update_tree_node_queue(self, splitinfos, max_depth_reach):
LOGGER.info(
"update tree node, splitlist length is {}, tree node queue size is"
.format(len(splitinfos), len(self.tree_node_queue)))
new_tree_node_queue = []
for i in range(len(self.tree_node_queue)):
sum_grad = self.tree_node_queue[i].sum_grad
sum_hess = self.tree_node_queue[i].sum_hess
if max_depth_reach or splitinfos[i].gain <= \
self.min_impurity_split + consts.FLOAT_ZERO:
self.tree_node_queue[i].is_leaf = True
else:
self.tree_node_queue[i].left_nodeid = self.tree_node_num + 1
self.tree_node_queue[i].right_nodeid = self.tree_node_num + 2
self.tree_node_num += 2
left_node = Node(id=self.tree_node_queue[i].left_nodeid,
sitename=self.sitename,
sum_grad=splitinfos[i].sum_grad,
sum_hess=splitinfos[i].sum_hess,
weight=self.splitter.node_weight(
splitinfos[i].sum_grad,
splitinfos[i].sum_hess))
right_node = Node(id=self.tree_node_queue[i].right_nodeid,
sitename=self.sitename,
sum_grad=sum_grad - splitinfos[i].sum_grad,
sum_hess=sum_hess - splitinfos[i].sum_hess,
weight=self.splitter.node_weight( \
sum_grad - splitinfos[i].sum_grad,
sum_hess - splitinfos[i].sum_hess))
new_tree_node_queue.append(left_node)
new_tree_node_queue.append(right_node)
self.tree_node_queue[i].sitename = splitinfos[i].sitename
if self.tree_node_queue[i].sitename == self.sitename:
self.tree_node_queue[i].fid = self.encode(
"feature_idx", splitinfos[i].best_fid)
self.tree_node_queue[i].bid = self.encode(
"feature_val", splitinfos[i].best_bid,
self.tree_node_queue[i].id)
self.tree_node_queue[i].missing_dir = self.encode(
"missing_dir", splitinfos[i].missing_dir,
self.tree_node_queue[i].id)
else:
self.tree_node_queue[i].fid = splitinfos[i].best_fid
self.tree_node_queue[i].bid = splitinfos[i].best_bid
self.update_feature_importance(splitinfos[i])
self.tree_.append(self.tree_node_queue[i])
self.tree_node_queue = new_tree_node_queue
def test_node(self):
param_dict = {
"id": 5,
"sitename": "test",
"fid": 55,
"bid": 555,
"weight": -1,
"is_leaf": True,
"sum_grad": 2,
"sum_hess": 3,
"left_nodeid": 6,
"right_nodeid": 7
}
node = Node(id=5,
sitename="test",
fid=55,
bid=555,
weight=-1,
is_leaf=True,
sum_grad=2,
sum_hess=3,
left_nodeid=6,
right_nodeid=7)
for key in param_dict:
self.assertTrue(param_dict[key] == getattr(node, key))
def fit(self):
LOGGER.info("begin to fit guest decision tree")
self.sync_encrypted_grad_and_hess()
# LOGGER.debug("self.grad and hess is {}".format(list(self.grad_and_hess.collect())))
root_sum_grad, root_sum_hess = self.get_grad_hess_sum(self.grad_and_hess)
root_node = Node(id=0, sitename=self.sitename, sum_grad=root_sum_grad, sum_hess=root_sum_hess,
weight=self.splitter.node_weight(root_sum_grad, root_sum_hess))
self.tree_node_queue = [root_node]
self.dispatch_all_node_to_root()
for dep in range(self.max_depth):
LOGGER.info("start to fit depth {}, tree node queue size is {}".format(dep, len(self.tree_node_queue)))
self.sync_tree_node_queue(self.tree_node_queue, dep)
if len(self.tree_node_queue) == 0:
break
self.sync_node_positions(dep)
self.data_bin_with_node_dispatch = self.data_bin.join(self.node_dispatch,
lambda data_inst, dispatch_info: (
data_inst, dispatch_info))
batch = 0
splitinfos = []
for i in range(0, len(self.tree_node_queue), self.max_split_nodes):
self.cur_split_nodes = self.tree_node_queue[i: i + self.max_split_nodes]
node_map = {}
node_num = 0
for tree_node in self.cur_split_nodes:
node_map[tree_node.id] = node_num
node_num += 1
acc_histograms = self.get_histograms(node_map=node_map)
self.best_splitinfo_guest = self.splitter.find_split(acc_histograms, self.valid_features,
self.data_bin._partitions,
self.sitename,
self.use_missing, self.zero_as_missing)
self.federated_find_split(dep, batch)
final_splitinfo_host = self.sync_final_split_host(dep, batch)
cur_splitinfos = self.merge_splitinfo(self.best_splitinfo_guest, final_splitinfo_host)
splitinfos.extend(cur_splitinfos)
batch += 1
max_depth_reach = True if dep + 1 == self.max_depth else False
self.update_tree_node_queue(splitinfos, max_depth_reach)
self.redispatch_node(dep)
self.sync_tree()
self.convert_bin_to_real()
tree_ = self.tree_
LOGGER.info("tree node num is %d" % len(tree_))
LOGGER.info("end to fit guest decision tree")
def fit(self):
LOGGER.info("begin to fit guest decision tree")
self.sync_encrypted_grad_and_hess()
root_sum_grad, root_sum_hess = self.get_grad_hess_sum(
self.grad_and_hess)
root_node = Node(id=0,
sitename=consts.GUEST,
sum_grad=root_sum_grad,
sum_hess=root_sum_hess,
weight=self.splitter.node_weight(
root_sum_grad, root_sum_hess))
self.tree_node_queue = [root_node]
self.dispatch_all_node_to_root()
for dep in range(self.max_depth):
LOGGER.info(
"start to fit depth {}, tree node queue size is {}".format(
dep, len(self.tree_node_queue)))
self.sync_tree_node_queue(self.tree_node_queue, dep)
if len(self.tree_node_queue) == 0:
break
self.sync_node_positions(dep)
node_map = {}
node_num = 0
for tree_node in self.tree_node_queue:
node_map[tree_node.id] = node_num
node_num += 1
self.data_bin_with_node_dispatch = self.data_bin.join(
self.node_dispatch, lambda data_inst, dispatch_info:
(data_inst, dispatch_info))
acc_histograms = self.get_histograms(node_map=node_map)
self.best_splitinfo_guest = self.splitter.find_split(
acc_histograms, self.valid_features)
self.federated_find_split(dep)
final_splitinfo_host = self.sync_final_split_host(dep)
splitinfos = self.merge_splitinfo(self.best_splitinfo_guest,
final_splitinfo_host)
max_depth_reach = True if dep + 1 == self.max_depth else False
self.update_tree_node_queue(splitinfos, max_depth_reach)
self.redispatch_node(dep)
self.sync_tree()
self.convert_bin_to_real()
tree_ = self.tree_
LOGGER.info("tree node num is %d" % len(tree_))
self.predict_weights = self.node_dispatch.mapValues(
lambda unleaf_state_nodeid: tree_[unleaf_state_nodeid[1]].weight)
LOGGER.info("end to fit guest decision tree")
def sync_tree_node_queue(self, tree_node_queue, dep=-1):
LOGGER.info("send tree node queue of depth {}".format(dep))
mask_tree_node_queue = copy.deepcopy(tree_node_queue)
for i in range(len(mask_tree_node_queue)):
mask_tree_node_queue[i] = Node(id=mask_tree_node_queue[i].id)
self.transfer_inst.tree_node_queue.remote(mask_tree_node_queue,
role=consts.HOST,
idx=-1,
suffix=(dep, ))
"""
def sync_tree_node_queue(self, tree_node_queue, dep=-1):
LOGGER.info("send tree node queue of depth {}".format(dep))
mask_tree_node_queue = tree_node_queue.copy()
for i in range(len(mask_tree_node_queue)):
mask_tree_node_queue[i] = Node(id=mask_tree_node_queue[i].id)
federation.remote(obj=mask_tree_node_queue,
name=self.transfer_inst.tree_node_queue.name,
tag=self.transfer_inst.generate_transferid(self.transfer_inst.tree_node_queue, dep),
role=consts.HOST,
idx=0)
def set_model_param(self, model_param):
self.tree_node = []
for node_param in model_param.tree_:
_node = Node(id=node_param.id,
sitename=node_param.sitename,
fid=node_param.fid,
bid=node_param.bid,
weight=node_param.weight,
is_leaf=node_param.is_leaf,
left_nodeid=node_param.left_nodeid,
right_nodeid=node_param.right_nodeid,
missing_dir=node_param.missing_dir)
self.tree_node.append(_node)
def set_model_param(self, model_param):
self.tree_ = []
for node_param in model_param.tree_:
_node = Node(id=node_param.id,
sitename=node_param.sitename,
fid=node_param.fid,
bid=node_param.bid,
weight=node_param.weight,
is_leaf=node_param.is_leaf,
left_nodeid=node_param.left_nodeid,
right_nodeid=node_param.right_nodeid)
self.tree_.append(_node)
self.split_maskdict = dict(model_param.split_maskdict)
def fit(self):
"""
start to fit
"""
LOGGER.info('begin to fit h**o decision tree, epoch {}, tree idx {}'.format(self.epoch_idx, self.tree_idx))
# compute local g_sum and h_sum
g_sum, h_sum = self.get_grad_hess_sum(self.g_h)
# get aggregated root info
self.aggregator.send_local_root_node_info(g_sum, h_sum, suffix=('root_node_sync1', self.epoch_idx))
g_h_dict = self.aggregator.get_aggregated_root_info(suffix=('root_node_sync2', self.epoch_idx))
global_g_sum, global_h_sum = g_h_dict['g_sum'], g_h_dict['h_sum']
# initialize node
root_node = Node(id=0, sitename=consts.GUEST, sum_grad=global_g_sum, sum_hess=global_h_sum, weight=
self.splitter.node_weight(global_g_sum, global_h_sum))
self.cur_layer_node = [root_node]
LOGGER.debug('assign samples to root node')
self.inst2node_idx = self.assign_instance_to_root_node(self.data_bin, 0)
for dep in range(self.max_depth):
if dep + 1 == self.max_depth:
for node in self.cur_layer_node:
node.is_leaf = True
self.tree_node.append(node)
rest_sample_weights = self.get_node_sample_weights(self.inst2node_idx, self.tree_node)
if self.sample_weights is None:
self.sample_weights = rest_sample_weights
else:
self.sample_weights = self.sample_weights.union(rest_sample_weights)
# stop fitting
break
LOGGER.debug('start to fit layer {}'.format(dep))
table_with_assignment = self.data_bin.join(self.inst2node_idx, lambda inst, assignment: (inst, assignment))
# send current layer node number:
self.sync_cur_layer_node_num(len(self.cur_layer_node), suffix=(dep, self.epoch_idx, self.tree_idx))
split_info, agg_histograms = [], []
for batch_id, i in enumerate(range(0, len(self.cur_layer_node), self.max_split_nodes)):
cur_to_split = self.cur_layer_node[i:i+self.max_split_nodes]
node_map = self.get_node_map(nodes=cur_to_split)
LOGGER.debug('node map is {}'.format(node_map))
LOGGER.debug('computing histogram for batch{} at depth{}'.format(batch_id, dep))
local_histogram = self.get_left_node_local_histogram(
cur_nodes=cur_to_split,
tree=self.tree_node,
g_h=self.g_h,
table_with_assign=table_with_assignment,
split_points=self.bin_split_points,
sparse_point=self.bin_sparse_points,
valid_feature=self.valid_features
)
LOGGER.debug('federated finding best splits for batch{} at layer {}'.format(batch_id, dep))
self.sync_local_node_histogram(local_histogram, suffix=(batch_id, dep, self.epoch_idx, self.tree_idx))
agg_histograms += local_histogram
split_info = self.sync_best_splits(suffix=(dep, self.epoch_idx))
LOGGER.debug('got best splits from arbiter')
new_layer_node = self.update_tree(self.cur_layer_node, split_info)
self.cur_layer_node = new_layer_node
self.update_feature_importance(split_info)
self.inst2node_idx, leaf_val = self.assign_instance_to_new_node(table_with_assignment, self.tree_node)
# record leaf val
if self.sample_weights is None:
self.sample_weights = leaf_val
else:
self.sample_weights = self.sample_weights.union(leaf_val)
LOGGER.debug('assigning instance to new nodes done')
self.convert_bin_to_val()
LOGGER.debug('fitting tree done')
LOGGER.debug('tree node num is {}'.format(len(self.tree_node)))
